Lamp.



A. w. HALL.

LAMP.

AIPLIOATION FILED APIM, 190a.

Patented Jan. 12,1909,

lllllilllllli llllllllllllllllilli I amen-tea Anson IV. Hall Wit" wasUNITED s'm't as PATENT OFFICE.

ANSON W. HALL, OF JZIilLSZ-OWN, PENNSYLVANIA.

Specification of Letters Patent.

Patented Jan. 12, 19091 Application fine April 4, 1908. Serial No.425,246.

To all whom it may concern:

Be it known that I, Anson W. HALL, a-

citizen of the United States, residing at Johnstown, in the county ofCambria and State ofPennsylvania, have invented new and usefulImprovements 'in Lamps, of which the following is a specification.

This invention relates to improvements in lamps, and particularly safetylamps for the use of miners, the object of the invention being toprovide a novel construction of locking means for securing the oil fontor pot of the lamp to the body of the lamp in such manner as to preventremoval of the font except'by anauthorized person pro vided with a.proper type of key.

The invention consists of the features of construction, combination andarrangement of parts hereinafter fully described and claimed, referencebeing had to the accompanying drawing, in which Figure 1 is a sideelevation of a commercial type of miners safety lamp embodying myinvention. Fig. 2 is an elevation, rtially in section, of the lowerportion o i he lamp body and the font. Fig. 3 is a detail view of thelocking dog. Fig. 4 is asimilar view of the key. 4

Referring to the drawing; the numeral 1 designates the base of the bodyof the lamp, on which the burner is mounted in the ordinary or anypreferred manner, which base is provided with 2. depending internallythreaded flange 2, the lower edge ofivhich is formed at one point in itscircumference with a keepensocket or recess 3 having at I one end astraight or abrupt locking shoul- 'der 4 and provided with a beveled orinclined up er. wall 5 leading therefrom to the basal sur ace of theflange.

. The oil fontor putt is formed at its up per end with an externallythreaded flange 7 for en agement with the threads of the flange 2, bywhich said font is adapted to be secured in position at the lower end ofthe body of the lam to form the base of the complete lamp. lhe flange 7is of reduced diameter with respect to the vertical wall of the font andis connected therewith by an inturned annular horizontal ledge orshoulder 8,which is formed with a slot 9 substantially coextensive inlength with the locking recess 3.. Below said slot 9 the vertical wallof the font 6 is provided with a chamber 10 having at one side of itscenter a horizontal shoulder 11 and at the opposite and arm 18 of thedog,

side of its center a depending recess or enlar ement 12. Fixed to theinner wall of sai chamber adjacent the up er end of said recess is aguard pin 13, whic projects into and is ex osed through a keyhole 14 inthe outer wa l of the chamber, said keyhole being of approximatelycircular form and having a substantially U-shaped base or extension 15.l l

Alocking dog 16, comprisin an elongated metallic strip, is arrangedwithin the chamber 10 and mounted to swing vertically upon apivot pin17, the pivotm point being closer to one end of the do t an to its 0posite end, thus eccentrically mounting vt ing arm 19 of unequal engths.Asu tantially V-sha ed leaf spring 20 is in the chambe one llif of saidspring bearing on said shoulder and the other on said arm, thus normallyprejectin the arm 18 upward through the slot 9, whi e the arm 19 is helddepressed within the chamber immediately above the guardv pin 13. A. key25 is provided for retracting the dog or recess 21 at its outer end toreceive and engage the pin 13, thus allowing said key to ber, and alsowith a bit 22 of proper form to fit the portion 15 of the keyhole. Theshort end or arm 19 of the dog is provided with a depending projection19 to prevent the bit of the key from sli ping off the end of said arm,and wedging lietween the same and adjacent wall of the recess.

font, the flange 7 is screwed within the flange 2 of the base of thelamp in the ordinary way until the ledge 7 bears against the lower faceof said flange 2, the arm 18 of the dog being held against theresistance of the spring down into the chamber 10 by the pressure of thebottom face of the flange 2 until said dog comes into alinement with beprojected by the spring into said recess and held therein so that theend of said arm will bear against the shoulder 4. By this means the fontwill be locked against retrograde rotation in its fully appliedposition, so that it cannot be removed, except through the retraction ofthe dog by the use of a proper form of key, such as that shown.

it will be understood that the inclined wall difiposed r 10 between theshoe or 11.

In the operation of applying the filled the recess 3, at which time thearm 18 will dog to provide a lockin arm 18 and 0 ratand 1s formed with astem having a socket be inserted into the portion 12 of the chamof therecess-3 will permit the font to be turned a little further around forthe pun pose of tightening the threaded connection between the flangeswhen they become slightly loosened from wear, but that anyattempt toremove the font by reverse rotation will result in the engagement of thedog with the shoulder 4, whereby such attempt would be defeated. Inorder :to' release the dog for the removal of the font, the he isapplied in an obvious manner and turne so as to'brin its bit 22 intocontact with the underside o? the arm' 19, whereupon the dog will beswung to a horizontal position, thus retracting the arm 18 andpermitting the font to be screwed oil.

The invention will be found of value to prevent the removal of the fontsof lamps by unauthorized persons, or by any one other than a fire-bossor other authorized person provided with the proper type oi key, thusobviating the danger of the ignition and explosion of gases in the minefrom careless l-removal' of the font and exposure of the lamp flame.Unless the miner is provided with a key, he cannot remove the font, andyet the construction of the lock is such as to enable it to be removedfor filling or other purposes by an authorized oflicial, without thenecessity of the miner traveling a considerable distance to a station,as is neces sary where complicated locks which can only 'be opened bythe use of magnets or complicated mechanism are employed. I

Having thus fully described the inven: tiou, what is claimed as new isi- 1. In a lock forlainps, the combination of a lamp body having athreaded base pro vided in the underside thereof with a recess having anabrupt shoulder and an inclined wall, a lamp font provided with acoiiperat ing threaded portion and formed with a horizontal chamberopening through its upper edge, said chamber being provided at one sideof its center with a horizontal shoulder and at the opposite side of itscenter with a depending recess or enlargement, the

der and the locking arm to tilt the dog and project said locking arm forengagement with said recess and shoulder upon the lamp base, and a keyguide within said recess or enlargement and in alinement with the keyhole. I V v 2. In a lock for lamps, the combination of 'a lamp bodyhaving a threaded base provided in the underside thereof with a recesshaving an abrupt shoulder and an inclined wall, a lamp font providedwith a cooperating threaded portion and formed with a horizontal chamberopening through its upper edge, said chamber being provided at one sideofits center with a horizontal. shoulder and at the opposite side of itscenter with a depending recess or enlargement, the latter having akeyhole leading thereto, a dog comprising a bar eccentrically pivotedwithin said chamber and having a locking arm located above the shoulderin said chamher and an operating arm located above said recess, a springdisposed between said shoulder and the lockingarm to tilt the dog andproject said locking arm for engagement with said recess and shoulderupon the lamp base, a key guide within said recess or enlargementand inalinement with the keyhole and a depending lip or projection upon theoperating arm of the dog arranged to coop'eratewith said guide and thebit of the Key In testimony whereof I afiix my. signature in presence oftwo witnesses.

ANSON w. HALF Witnesses:

JoHN H. Mommy, ARTHUR E. HENDLEY.

